Ahmet Demirhan UYGUN, Halit ALADAĞ

FARKLI NİKEL-TİTANYUM DÖNER ALET SİSTEMLERİNİN FARKLI KİNEMATİKLERDE KULLANIMININ ENDODONTİK TEDAVİ GÖRMÜŞ KÖKLERİN KIRILMA DİRENCİNE OLAN ETKİSİNİN İNCELENMESİ

Amaç. Çalışmamızın amacı ProTaper Universal (PTU), ProTaper Gold (PTG), Twisted File Adaptive (TFA) ve WaveOne (WO) NiTi Döner Alet sistemlerini farklı kinematiklerde kullanarak yapılan kök kanal şekillendirilmesinin dişlerin kırılma dirençlerine olan etkisini araştırmaktır. Gereç ve Yöntem. Tek köklü ve tek kanallı 160 adet alt kesici dişler seçildi. Dişler mine-sement birleşim yerinden ayrıldıktan sonra örnekler 8 gruba bölündü (n=20). Grup 1 hariç diğer gruplarda 10 K-tipi eğe kök kanallarında ilerletildi ve bu boydan 1 mm çıkartılarak çalışma uzunluğu belirlendi. 15 K-tipi eğe ile kayma yolu oluşturuldu. Kontrol grubunda köklere hiçbir şekillendirme işlemi yapılmadı. WO eğeleri sadece resiprokasyon hareketinde kullanıldı. Diğer eğeler ise hem üretici talimatlarındaki hareketle hem de resiprokasyon hareketiyle kullanıldılar. Örneklere periodontal ligamentleri taklit etmesi amacıyla elastomerik ölçü maddesi kullanıldı. Daha sonra Universal test cihazında 1mm/ dakika hızla örneklere kuvvet uygulandı. Örneklerde kırılmaya neden olan maksimum kuvvet değerleri ( F-Max) belirlendi ve sonuçlar tek yönlü varyans analizi (ANOVA) ve post-hoc LSD testleri kullanılarak istatistiksel değerlendirilmeye tabi tutuldu. (P<0.05) Bulgular. Kontrol grubu en yüksek kırılma direncine sahipti ve PTU, PTU resiprokasyon ve PTG ve PTG resiprokasyon sistemleriyle arasında istatistiksel açıdan anlamlı fark vardı. (P<0.05). TFA, TFA resiprokasyon ve WO grupları ile kontrol grubu arasında köklerin kırılmaya karşı dirençleri açısından istatistiksel olarak anlamlı fark yoktu (P>0.05). Sonuç. Çalışmamızda rotasyon veya resiprokasyon hareketiyle kök kanalları genişletilmesinin dişlerin kırılma direncinde bir fark yaratmadığı görülmüştür fakat PTU ve PTG gruplarının dişlerin kırılma dirençlerini azalttığı sonucuna varılmıştır. Anahtar Kelimeler: ProTaper, Adaptive hareket, Rotasyon, Resiprokasyon Evaluation of the Effect of Different Nickel-Titanium Systems by Using Different Kinematics on the Fracture Resistance of Endodontically Treated Roots ABSTRACT Aim. The aim of our study is to investigate the effect of the preparation on the fracture resistance of teeth by using ProTaper Universal (PTU), ProTaper Gold (PTG), Twisted File Adaptive (TFA) and WaveOne (WO) NiTi rotary instrument systems in different kinematics. Material and methods. 160 mandibular incisor teeth with single root and single canal were chosen. After the teeth were separated from the cementoenamel junction, the roots were divided into eight groups (n=20). All groups except for group 1, the working length of the root canals were determined by inserting a size 10 K-type file into the root canal terminus and subtracting 1 mm from this measurement. A glide path was done via a size 15 K-type file. In the control group, the root canals were not prepared. WO files were used only in the reciprocating motion. Other files were used both with the movement in the manufacturer's instructions and with the reciprocating movement. The periodontal ligament was simulated by using elastomeric impression material. Vertical loading was carried out with a universal testing machine at 1 mm/min crosshead speed. The maximum force at fracture (F-max) was recorded for each root and the data were analyzed statistically by one way analysis of variance (ANOVA) and post-hoc LSD tests (P<0.05). Results. The control group presented the highest fracture resistance and differed significantly from PTU, PTU reciprocation, PTG and PTG reciprocation groups (P<0.05). There were no significant differences in the fracture resistance between control group, and TFA, TFA reciprocation and WO groups (P>0.05). Conclusion. In our study, it was observed that the root canal preparation did not make a difference in the fracture resistance of the teeth by rotation or reciprocation movement, but it was concluded that PTU and PTG groups reduced the fracture resistance of the teeth. Key Words: ProTaper, Adaptive motion, Rotation, Reciprocation

Anahtar Kelimeler:

ProTaper, Adaptive hareket, Rotasyon, Resiprokasyon

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